UST887016I4 - Defensive publication - Google Patents
Defensive publication Download PDFInfo
- Publication number
- UST887016I4 UST887016I4 US887016DH UST887016I4 US T887016 I4 UST887016 I4 US T887016I4 US 887016D H US887016D H US 887016DH US T887016 I4 UST887016 I4 US T887016I4
- Authority
- US
- United States
- Prior art keywords
- silver halide
- iodide
- halogen
- grains
- emulsion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
- G03C1/08—Sensitivity-increasing substances
Definitions
- High contrast photographic silver halide emulsions comprising unfogged silver halide grains, the halide of the silver halide being at least 50 mol percent chloride, have on the surface thereof a halogen acceptor and a sufficient quantity of iodide to effectively increase the speed of said silver halide, said quantity of iodide being in addition to any iodide present in said grains as mixed silver halide.
- the iodide is added to the grains in the form of a water-soluble salt, e.g., an alkali metal or ammonium iodide.
- the halogen-accepting compounds have an anodic polarographic half-wave potential less than 0.85 wit and a cathodic polarographic half-wave potential more negative than l.0 volt.
- Merocyanine halogen acceptors give good results.
- the iodide salt is preferably potassium iodide employed in the emulsion at a concentration of about .1 to 3 grams per mole of silver halide; the emulsion is preferably a fine grain emulsion having an average grain size less than about .5 micron; and, the halogen acceptor is preferably the merocyanine dye 1-carboxymethyl-5-[(3- ethyl Z-benzoxazolinylidene)ethylidene]-3-phenyl-2-thiohydantoin, which is advantageously used at about 450 mg. per mole of silver halide.
Abstract
HIGH CONTRAST PHOTOGRAPHIC SILVER HALIDE EMULSIONS COMPRISING UNFOGGED SILVER HALIDE GRAINS, THE HALIDE OF THE SILVER HALIDE BEING AT LEAST 50 MOL PERCENT CHLORIDE, HAVE ON THE SURFACE THEREOF A HALOGEN ACCEPTOR AND A SUFFICIENT QUANTITY OF IODIDE TO EFFECTIVELY INCREASE THE SPEED OF SAID SILVER HALIDE, SAID QUANTITY OF IODIDE BEING IN ADDITION TO ANY IODIDE PRESENT IN SAID GRAINS AS MIXED SILVER HALIDE. PREFERABLY, THE IODIDE IS ADDED TO THE GRAINS IN THE FORM OF A WATER-SOLUBLE SALT, E.G., AN ALKALI METAL OR AMMONIUM IODIDE. THE HALOGEN-ACCEPTING COMPOUNDS HAVE AN ANODIC POLAROGRAPHIC HALF-WAVE POTENTIAL LESS THAN 0.85 VOLT AND A CATHODIC POLAROGRAPHIC HALF-WAVE POTENTIAL MORE NEGATIVE THAN - 1.0 VOLT. MEROCYANINE HALOGEN ACCEPTORS GIVE GOOD RESULTS. THE IODIDE SALT IS PREFERABLY POTASSIUM IODIDE EMPLOYED IN THE EMULSION AT A CONCENTRATION OF ABOUT .1 TO 3 GRAMS PER MOLE OF SILVER HALIDE; THE EMULSION IS PREFERABLY A FINE GRAIN EMULSION HAVING AN AVERAGE GRAIN SIZE LESS THAN ABOUT .5 MICRON; AND, THE HALOGEN ACCEPTOR IS PREFERABLY THE MEROCYANINE DYE 1-CARBOXYMETHYL-5-((3ETHYL-2-BENZOXAZOLINYLIDENE)ETHYLIDENE)-3-PHENYL-2 -THIOHYDANTOIN, WHICH IS ADVANTAGEOUSLY USED AT ABOUT 450 MG. PER MOLE OF SILVER HALIDE.
Description
DEFENSIVE PULlCATl N UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.
Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Office makes no assertion as to the novelty of the disclosed subject matter.
PUBLISHED JUNE 1, 1971 T887,016 PHOTOGRAPHIC MATERIALS Kirby M. Milton, Victor, N.Y. (Kodak Park, Rochester, N .Y. 14650) Filed Nov. 16, 1970, Ser. No. 90,123 Int. Cl. G03c 1/28 US. Cl. 96107 No Drawing. 19 Pages Specification High contrast photographic silver halide emulsions comprising unfogged silver halide grains, the halide of the silver halide being at least 50 mol percent chloride, have on the surface thereof a halogen acceptor and a sufficient quantity of iodide to effectively increase the speed of said silver halide, said quantity of iodide being in addition to any iodide present in said grains as mixed silver halide. Preferably, the iodide is added to the grains in the form of a water-soluble salt, e.g., an alkali metal or ammonium iodide. The halogen-accepting compounds have an anodic polarographic half-wave potential less than 0.85 wit and a cathodic polarographic half-wave potential more negative than l.0 volt. Merocyanine halogen acceptors give good results. The iodide salt is preferably potassium iodide employed in the emulsion at a concentration of about .1 to 3 grams per mole of silver halide; the emulsion is preferably a fine grain emulsion having an average grain size less than about .5 micron; and, the halogen acceptor is preferably the merocyanine dye 1-carboxymethyl-5-[(3- ethyl Z-benzoxazolinylidene)ethylidene]-3-phenyl-2-thiohydantoin, which is advantageously used at about 450 mg. per mole of silver halide.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US9012370A | 1970-11-16 | 1970-11-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
UST887016I4 true UST887016I4 (en) | 1971-06-01 |
Family
ID=22221427
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US887016D Pending UST887016I4 (en) | 1970-11-16 | 1970-11-16 | Defensive publication |
Country Status (1)
Country | Link |
---|---|
US (1) | UST887016I4 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4268620A (en) | 1977-01-31 | 1981-05-19 | Konishiroku Photo Industry Co., Ltd. | Method of processing of light-sensitive silver halide photographic material |
-
1970
- 1970-11-16 US US887016D patent/UST887016I4/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4268620A (en) | 1977-01-31 | 1981-05-19 | Konishiroku Photo Industry Co., Ltd. | Method of processing of light-sensitive silver halide photographic material |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3519426A (en) | Preparation of silver halide emulsions having high covering power | |
JPH0222934B2 (en) | ||
UST887016I4 (en) | Defensive publication | |
GB1353521A (en) | Photographic materials | |
JPS5863933A (en) | Image formation method | |
US3647459A (en) | Novel photographic elements and means for rapid processing of photographic elements | |
US3740226A (en) | Fogged direct-positive silver halide emulsions containing triazolium salts and the use thereof in reversal processes | |
US3573049A (en) | Photographic materials and processes for developing photographic compositions having a zwitterionic and anionic elements | |
US3901709A (en) | Lith-type silver halide photographic material containing a polyalkylene oxide and a heterocyclic mercaptan | |
UST864011I4 (en) | Defensive publication | |
US3326690A (en) | Silver halide emulsions with increased sensitivity | |
US3514289A (en) | Photographic materials containing metal salts | |
JPS62157025A (en) | Photographic composition containing nuclus forming development controlling agent | |
JPS584136A (en) | Photographic silver halide element containing antipollution agent or antipollution agent precursor | |
US3589908A (en) | Photographic materials containing hydrophilic colloids | |
JPH035729B2 (en) | ||
US3782960A (en) | Direct-print light-developable emulsion containing silver halide grains sensitized on the surface with silver thiocyanate,iodide and gold compound | |
UST882019I4 (en) | Defensive publication | |
UST888005I4 (en) | Defensive publication | |
JP4130516B2 (en) | Industrial radiography products | |
UST884006I4 (en) | Defensive publication | |
UST887024I4 (en) | Defensive publication | |
UST909009I4 (en) | Defensive publication | |
UST887009I4 (en) | Defensive publication | |
US4207103A (en) | Photographic print-out silver halide process |